Utilizing full-exchange capacity of zeolites by alkaline leaching: Preparation of Fe-ZSM5 and application in N2O decomposition

Melián‐Cabrera, Ignacio; Espinosa, Silvia; Groen, Johan C.; VDLINDEN, B; Kapteijn, Freek; Moulijn, Jacob A.

doi:10.1016/j.jcat.2005.11.034

Cited by 113 publications

(35 citation statements)

References 60 publications

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“…Similar observations have been reported when desilicating various MFI zeolites with NaOH [31]. Melian et al desilicated ZSM5 with NaOH to prepare fully exchanged Fe-ZSM5 [32]. When the Si/Al ratio decreases following catalyst treatment as reported elsewhere [32], an increase in the exchange capacity of the material is observed.…”

Section: Catalyst Characterisationsupporting

confidence: 78%

“…Melian et al desilicated ZSM5 with NaOH to prepare fully exchanged Fe-ZSM5 [32]. When the Si/Al ratio decreases following catalyst treatment as reported elsewhere [32], an increase in the exchange capacity of the material is observed. For the current experiments this is not applicable due to simultaneous reduction of the aluminium content.…”

Section: Catalyst Characterisationmentioning

confidence: 93%

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Zeolite-supported iron catalysts for allyl alcohol synthesis from glycerol

Sánchez

Dlugogorski

Kennedy

et al. 2016

Applied Catalysis A: General

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Alkaline preparation conditions engendered the zeolite with mesoporosity;Rubidium deposition enhanced allyl alcohol yield and decreased acrolein yield;Alkali post synthesis modification reduced the concentration of acid sites. AbstractUnder most reaction conditions studied, acrolein is reported as the primary product in the conversion of glycerol over zeolites. In such processes, acrolein forms at relatively high yields, with negligible allyl alcohol selectivity. In this contribution, we report the development of ZSM5-supported iron catalysts, modified by rubidium deposition, as stable materials for production of allyl alcohol from glycerol. Our results demonstrate a reduced rate of formation of acrolein over modified catalysts. Both unmodified and modified catalysts were analysed by inductively coupled plasma optical emission spectrometry, nitrogen adsorption, scanning electron microscope, X-ray diffraction, ammonia temperature programmed desorption, X-ray photoelectron spectroscopy and ultraviolet-visible spectroscopy. These techniques revealed that differences in product distribution and catalyst performance are due to the combined effects of iron loading, catalyst acidity and changes in the porosity of the catalyst.2

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Section: Catalyst Characterisationsupporting

confidence: 78%

Section: Catalyst Characterisationmentioning

confidence: 93%

Zeolite-supported iron catalysts for allyl alcohol synthesis from glycerol

Sánchez

Dlugogorski

Kennedy

et al. 2016

Applied Catalysis A: General

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“…Since also NH 3 -TPD concludes that the acid capacities and strengths are identical the differences in activity can most likely be attributed to a higher accessibility to the rhenium caused by the mesoporosity. This effect has also been observed by Melia´n-Cabrera et al [17] where the accessibility in ion exchange in a ZSM-5 zeolite is improved by introducing mesopores.…”

Section: Resultssupporting

confidence: 76%

Dehydrogenation of Light Alkanes Over Rhenium Catalysts on Conventional and Mesoporous MFI Supports

et al. 2006

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Recently, Re/HZSM-5 (Si/Al = 15) was shown to be an efficient catalyst for ethane dehydrogenation and aromatization at 823 K and atmospheric pressure. In this reaction, the major initial products were benzene, toluene and xylene (BTX), but increasing amounts of ethene were produced with time on stream due to deactivation of the catalyst. We show that by use of rhenium impregnated MFI supports with very few or no acidic sites (Si/Al > 500), highly selective ethane dehydrogenation catalysts are obtained with ethene selectivities of 98%. By use of mesoporous MFI supports (Si/Al >500) the lifetime of the catalyst appears to be slightly improved compared to conventional MFI crystals. The beneficial effect of a mesoporous MFI support is convincingly demonstrated in propane dehydrogenation, where both conversion and selectivities on the mesoporous MFI (Si/Al > 500) impregnated with Re are significantly higher than on Re supported on a comparable conventional MFI support.

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“…The first method was demonstrated by Melién-Cabrera et al to decrease the diffusion path upon a mild alkaline treatment (11). It has been reported that heating at 353 K can achieve the full iron loading (12,13).…”

Section: Introductionmentioning

confidence: 99%

Fe−USY Zeolite Catalyst for Effective Decomposition of Nitrous Oxide

Shen

et al. 2007

Environ. Sci. Technol.

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Zeolite matrix FAU is applied as an effective support that can be readily exchanged with ferric ions simply by wet ion exchange. The high exchange degree in this zeolite (USY) probably benefits from its larger channel dimension, which makes the diffusion of hydrated ferric ions into the channels easier. The as-prepared and subsequently calcined Fe-USY samples contain various kinds of iron species, which enable Fe-USY to efficiently decompose N 2 O to N 2 and O 2 . The presence of O 2 (20%), H 2 O (2%), or both reduces the N 2 O conversion only to a small extent at the same temperature. To test the feasibility and the catalytic activity in a practical situation, we prepared a monolithic Fe-USY/cordierite sample and investigated the N 2 O conversion under similar conditions. Such a cordieritesupported Fe-USY catalyst (∼9 wt % USY and 0.5 wt % Fe) shows the catalytic performance in N 2 O decomposition similar to the pure Fe-USY catalyst. Remarkably, both the pure Fe-USY and Fe-USY/cordierite catalysts demonstrate a very good durability because there is no activity lost after 100 and 144 h tests. Thus, the Fe-USY zeolite shows its potential as a cost-effective catalyst for N 2 O elimination in future applications.

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Utilizing full-exchange capacity of zeolites by alkaline leaching: Preparation of Fe-ZSM5 and application in N2O decomposition

Cited by 113 publications

References 60 publications

Zeolite-supported iron catalysts for allyl alcohol synthesis from glycerol

Zeolite-supported iron catalysts for allyl alcohol synthesis from glycerol

Dehydrogenation of Light Alkanes Over Rhenium Catalysts on Conventional and Mesoporous MFI Supports

Fe−USY Zeolite Catalyst for Effective Decomposition of Nitrous Oxide

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